guns, immigration and foreign policy. that includes north korea that gets a mention after they say they conducted a 30 nuclear test that president obama calls highly provocative. the state of the union is part substance and part atmospherics. >> mr. speaker! the president of the united states! every year the mood is reflected in the chamber itself. despite the focus of speech and the memory of newtown will loom. lawmakers are inviting guests from all sides of the gun debate from former congresswoman gabrielle giffords who was a surprise guest will attend this year with her husband as the guest of john mccain and her former aide, ron barber. they star in an ad that will air after the president's address tonight. then the parents of slain teenager who will be guests of the first lady as will lieutenant brian murphy who was struck by 15 bullets responding to the sikh temple shooting. newtown victims and first responders will be there including a teacher who was wounded and survived. and then folks representing the other side